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Paper 1

Efficient Bell state analyzer for time-bin qubits with fast-recovery WSi superconducting single photon detectors

Raju Valivarthi, Itzel Lucio-Martinez, Allison Rubenok, Philip Chan, Francesco Marsili, Varun B. Verma, Matthew D. Shaw, J. A. Stern, Joshua A. Slater, Daniel Oblak, Sae Woo Nam, Wolfgang Tittel

Year

2014

Journal

arXiv preprint

DOI

arXiv:1410.4861

arXiv

1410.4861

We experimentally demonstrate a high-efficiency Bell state measurement for time-bin qubits that employs two superconducting nanowire single-photon detectors with short dead-times, allowing projections onto two Bell states, |Psi>- and |Psi+>. Compared to previous implementations for time-bin qubits, this yields an increase in the efficiency of Bell state analysis by a factor of thirty.

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Paper 2

Interferometric measurement of the biphoton wave function

Federica A. Beduini, Joanna A. Zielińska, Vito G. Lucivero, Yannick A. de Icaza Astiz, Morgan W. Mitchell

Year

2014

Journal

arXiv preprint

DOI

arXiv:1407.7683

arXiv

1407.7683

Interference between an unknown two-photon state (a "biphoton") and the two-photon component of a reference state gives a phase-sensitive arrival-time distribution containing full information about the biphoton temporal wave function. Using a coherent state as a reference, we observe this interference and reconstruct the wave function of single-mode biphotons from a low-intensity narrowband squeezed vacuum state.

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